Album cover stamps

This week the Post Office have issued a limited edition of stamps of 'classic' album covers - classic meaning presumably the artwork, not the music. How else does one account for the inclusion of Tubular Bells (Mike Oldfield) and Division Bell (Pink Floyd)?

My order for The Clash and New Order, snow willing, are winging there way to me. Hurray for that, but I fret that this is the seal of establishment approval. Pun intended!